JPH0679023U - Bus conductor for power equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a busbar conductor that can be reinforced without providing ribs that disturb the surrounding electric field. [Structure] A reinforcing core 511 made of a material having higher mechanical strength than the conductive material forming the bus bar main body is fixed inside the bus bar main body 510 made of a conductive material where reinforcement is required.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bus conductor used for passing a main circuit current in a power device such as a gas insulated switchgear.

[0002]

[Prior art]

 The busbar conductor used for passing a main circuit current in a gas-insulated switchgear or the like is generally made of a highly conductive material such as aluminum or a copper alloy. The busbar conductor is formed to have a required length, has a connection portion with the counterpart conductor at an end thereof, and the connection portion is connected to the counterpart conductor by bolting or screwing.

5 and 6 show a part of a conventional gas-insulated switchgear using a busbar conductor. FIG. 5 is a vertical sectional view, and FIG. 6 is a sectional view taken along the line CC of FIG. . In FIG. 5, reference numeral 1 denotes a busbar container of a gas insulated switchgear, which has a structure in which a branch pipe portion 1b is provided on a side surface of a main body 1a formed in a tubular shape. Flanges 1a1 and 1a2 are provided at both ends of the main body 1a of the busbar container, and the flanges 1a1 and 1a2 are connected to another container (not shown) via insulating spacers 2 and 3, respectively. A flange 1b1 is provided at the tip of the branch pipe portion 1b, and the flange 1b1 is connected to another container (not shown) via an insulating spacer 4. 5u to 5w are three-phase busbar conductors, and conductor connecting portions 5A and 5B connected to the mating conductors are provided at both ends of each busbar conductor. The conductor connecting portion 5A provided on one end side of each of the busbar conductors 5u to 5w includes a reduced diameter portion 501 formed to have a smaller diameter than the other portion of each busbar conductor, and a diameter from the tip of the reduced diameter portion 501. The flange portion 502 protrudes outward in the direction, and a rounded shield portion 503 is formed on the outer peripheral portion of the collar portion 502 so as not to disturb the surrounding electric field. As shown in FIG. 6, a large number of ribs 504, 504, ... Are radially provided across the outer peripheral surface of the reduced diameter portion 501 of the conductor connecting portion 5A and the collar portion 502. A large number of bolt insertion holes 505, 505, ... Are provided between these ribs.

The end surfaces of the conductor connecting portions 5A of the bus bar conductors 5u to 5w are flat surfaces, and are in contact with the end surfaces of the embedded conductors 201u to 201w provided so as to penetrate the insulating spacer 2. Then, the bolts 6, 6, ... respectively inserted in the bolt insertion holes 505, 505, ... provided in the collar-shaped portion 502 are screwed into the screw holes provided in the embedded conductors 201u to 201w, and the busbars are formed by these bolts. The conductor connecting portions 5A of the conductors 5u to 5w are fastened to the embedded conductors 201u to 201w of the insulating spacer. The shield portion 503 covers the head of the bolt 6 to prevent the head of the bolt from disturbing the surrounding electric field.

The conductor connecting portion 5B on the other end side of the bus bar conductors 5u to 5w is made by cutting the end face of each conductor flat without reducing the diameter, and each conductor connecting portion 5B is , A large number of screw holes opened on the end surface thereof. The end surfaces of the conductor connecting portions 5B of the busbar conductors 5u to 5w are brought into contact with the flange portions 701 provided at the tips of the relay conductors 7u to 7w fixed to the embedded conductors 301u to 301w of the insulating spacer 3, respectively, and the relay conductor 7u The flange portion 701 of 7w is fastened to the conductor connecting portion 5B of the busbar conductors 5u to 5w by the bolt 8. The relay conductors 7u to 7w are provided with a cup-shaped shield 702 that shields the head of the bolt 8.

Protrusions 505u to 505w that protrude toward the branch pipe portion 1b are formed in the middle of the busbar conductors 5u to 5w, and movable contacts 10u to 10w for disconnecting switches are attached to the tips of these protrusions, respectively. Has been. Fixed contacts 11u to 11w for disconnecting switches are attached to the embedded conductors 401u to 401w of the insulating spacer 4, and movable contacts 10u to 10w and fixed contacts 11u to 11w constitute busbar disconnecting switches DSu to DSw. . The movable contacts 10u to 10w are operated by an operation mechanism (not shown) to be displaced between a closed circuit position in contact with the fixed contacts 11u to 11w and an open circuit position in a state of being separated from the fixed contacts 11u to 11w.

[0007]

[Problems to be solved by the device]

 The bus bar conductor as described above is formed of a good conductive material having a relatively low mechanical strength such as aluminum or a copper alloy. Therefore, it may be necessary to reinforce the necessary parts so that the busbar conductor can withstand the stress generated by its own weight and the large current flowing in the event of an accident. In the example shown in FIG. 5, since the reduced diameter portion 501 of the conductor connecting portion 5A provided on one end side of the busbar conductor is apt to be a mechanical weak point, the reinforcing rib 504 is provided to reinforce the reduced diameter portion 501. I am trying to

However, when the reinforcing ribs are provided in this manner, the surrounding electric field is disturbed by the reinforcing ribs, so that there is a problem that a weak point of insulation is likely to occur.

If the reinforcing ribs 504 are provided at the ends of the busbar conductors, as described above, the reinforcing ribs 504 hinder bolting work when the ends of the busbar conductors are connected to the mating conductors by bolts. Therefore, there is also a problem that it takes time to connect the busbar conductors.

An object of the present invention is to provide a busbar conductor for electric power equipment, which is capable of improving mechanical strength without providing reinforcing ribs and without disturbing the surrounding electric field.

[0011]

[Means for Solving the Problems]

 The busbar conductor according to the present invention comprises a busbar body made of a conductive material, and a reinforcing core fixed to the inside of a portion made of a material having higher mechanical strength than the conductive material and requiring reinforcement of the busbar body. Is equipped with.

The reinforcing core may be provided over the entire bus bar main body, or may be provided only in a part of the bus bar main body, for example, near the end portion fixed to the mating conductor. That is, the “location requiring reinforcement of the busbar body” may be a part of the busbar body or the entire busbar body.

The method of fixing the reinforcing core is arbitrary. For example, a hole can be provided in the shaft core of the busbar body, and the reinforcing core can be fixed by means of screwing into the hole, press fitting, shrink fitting, or the like. When the busbar body is a cast product, a reinforcing core can be embedded inside the busbar body when the busbar body is cast.

The reinforcing core may be formed solid, but in order to reduce the weight of the busbar conductor, it is desirable to form the reinforcing core in a hollow shape.

[0015]

[Action]

 As described above, when the reinforcing core made of a material having higher mechanical strength than the conductive material forming the bus bar main body is fixed inside the bus bar main body, the reinforcing rib of the bus bar conductor can be formed without providing the reinforcing rib outside the bus bar conductor. Can be reinforced. In addition, since the reinforcing core is inside the busbar body and is not exposed to the outside, the busbar conductor can be reinforced without disturbing the surrounding electric field.

[0016]

【Example】

 1 and 2 show an embodiment of the present invention. In the figure, parts other than the bus conductors 5u to 5w are the same as the example shown in FIG. In the embodiment shown in FIG. 1, each busbar conductor has a busbar body 510 formed of a good conductive material such as aluminum or copper alloy into a predetermined shape, and a hollow body fixed to the shaft core of the busbar body 510. It is composed of a tubular reinforcing core 511. The reinforcing core 511 is made of a metal material such as iron or stainless steel having a mechanical strength higher than that of the conductive material forming the busbar body, and is provided over the entire length of the busbar body 510. In this embodiment, the bus bar main body 510 is made of a cast product, and the reinforcing core 511 is cast and embedded inside the bus bar main body at the time of casting.

FIG. 2 is a sectional view taken along the line AA of FIG. 1. As shown in the figure, no rib is provided on the contracted diameter portion 501 of the busbar body in this embodiment.

When the busbar conductor is configured as in the above-described embodiment, the reinforcing core 511 is arranged inside the busbar body made of a conductive material and is shielded by the busbar body, so that the reinforcing core is surrounded by the surroundings. It does not cause disturbance of the electric field. Therefore, according to the present invention, the busbar conductor can be reinforced without disturbing the surrounding electric field. Further, as described above, if the reinforcing core is formed hollow, the weight of the busbar conductor can be reduced.

In the above embodiment, the reinforcing core 511 is provided over the entire length of the busbar conductor. However, since the reinforcing core needs to be provided only at the portion where the busbar body needs to be reinforced, a part of the busbar body is provided. You may make it provide a reinforcement core only. For example, as shown in FIG. 3, the reinforcing core 511 may be fixed only inside the end portion where the reduced diameter portion 501 of the bus bar main body where the mechanical weak point is likely to be formed is provided.

FIG. 4 is a sectional view taken along the line BB in FIG. 3. As shown in FIG. 4, the rib of the reduced diameter portion 501 is omitted in this embodiment as well.

When fixing the straight reinforcing core 511 to the inside of the bus bar main body, a reinforcing core fixing hole is formed in advance in the shaft core portion of the bus bar main body, and the reinforcing core 51 is provided inside the reinforcing core fixing hole. 1 can be inserted and fixed by means such as press fitting, shrink fitting, and screwing. In this case, the bus bar body may be a cast product or may be formed by cutting or the like.

In the embodiment of FIG. 3, the reinforcing core 511 is fixed only inside the one end side where the reduced diameter portion 501 of the busbar body 510 is provided, but if necessary, the reduced diameter portion of the busbar conductor Reinforcement core may be fixed to the part where is not provided. For example, in the above embodiment, the reinforcing core can be fixed inside the other end side of the bus bar body 510 connected to the embedded conductor of the insulating spacer 3.

In the above embodiments, the busbar conductor supports the movable contact of the disconnector, but the present invention is not limited to such a busbar conductor, and the main circuit current can be applied to power equipment such as a gas-insulated switchgear. It can be widely applied to busbar conductors used for flowing.

Although the reinforcing core is formed hollow in the above-mentioned embodiments, it goes without saying that a solid reinforcing core can be used.

In the above embodiment, both ends of the busbar conductor are bolted to the mating conductor, but in the present invention, the connecting structure between the busbar conductor and the mating conductor is arbitrary.

[0026]

[Effect of device]

 As described above, according to the present invention, the reinforcing core made of a material having higher mechanical strength than the conductive material forming the busbar main body is fixed inside the portion of the busbar body that needs to be reinforced. The effect as shown can be obtained.

(A) It is not necessary to provide reinforcing ribs on the busbar conductor, and since the reinforcing core is inside the busbar body and does not affect the surrounding electric field, the busbar conductor does not disturb the surrounding electric field. Can be reinforced.

(B) By providing the reinforcing core, the amount of expensive conductive material forming the busbar conductor can be reduced, so that the cost can be reduced.

(C) When connecting the end portion of the busbar conductor to the mating conductor with a bolt, it is not necessary to provide a reinforcing rib that hinders the bolt tightening work, so that the busbar conductor connection work can be facilitated. it can.

(D) Since it is not necessary to provide reinforcing ribs and the surrounding electric field is not disturbed, it is possible to improve the dielectric strength of the power device. Therefore, the insulation distance can be reduced, which can contribute to downsizing of power equipment.

According to the invention described in claim 2, in particular, the following effects can be obtained. (E) Since the reinforcing core fixed in the busbar body is formed hollow, the weight of the busbar conductor can be reduced.

(F) Since the reinforcing core is formed to be hollow, it is possible to suppress the temperature rise during energization.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the present invention.

4 is a sectional view taken along line BB of FIG.

FIG. 5 is a longitudinal sectional view showing an example of an electric device using a conventional bus bar conductor.

6 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Busbar container 2,3,4 Insulation spacer 5u-5w Busbar conductor 510 Busbar main body 511 Reinforcement core

Claims (2)

[Scope of utility model registration request] 1. A busbar body made of a conductive material, and a reinforcing core made of a material having higher mechanical strength than that of the conductive material and fixed inside the busbar body where reinforcement is required. Bus conductor for power equipment. 2. The busbar conductor for electric power equipment according to claim 1, wherein the reinforcing core is formed to be hollow.